This page has quizzes, videos, and more! It's got pretty much everything you'll need (or want) this week! But if you want to see more, scroll down on this page to the heading "for kids"--even more videos, an interactive diagram, etc. This page has a Bill Nye the Science Guy clip.
This page has coloring and activity pages, along with helpful photos. Be aware that one of the first sentences speaks of evolution (sigh).
Here's a simple experiment, too, to demonstrate condensation--and you can take your pick on experiments from this page.
And guess what tune you can sing the fact to? Ah, yes. It's Farmer in the Dell.